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/****************************************************************************** |
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* Top contributors (to current version): |
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* Yoni Zohar, Andrew Reynolds, Gereon Kremer |
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* |
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* This file is part of the cvc5 project. |
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* |
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* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
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* in the top-level source directory and their institutional affiliations. |
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* All rights reserved. See the file COPYING in the top-level source |
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* directory for licensing information. |
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* **************************************************************************** |
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* |
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* The sep-pre-skolem-emp preprocessing pass. |
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*/ |
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#include "preprocessing/passes/sep_skolem_emp.h" |
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#include <string> |
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#include <unordered_map> |
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#include <vector> |
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#include "expr/node.h" |
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#include "expr/skolem_manager.h" |
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#include "preprocessing/assertion_pipeline.h" |
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#include "theory/quantifiers/quant_util.h" |
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#include "theory/rewriter.h" |
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#include "theory/theory.h" |
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namespace cvc5 { |
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namespace preprocessing { |
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namespace passes { |
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using namespace std; |
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using namespace cvc5::theory; |
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namespace { |
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Node preSkolemEmp(Node n, |
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bool pol, |
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std::map<bool, std::map<Node, Node>>& visited) |
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{ |
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std::map<Node, Node>::iterator it = visited[pol].find(n); |
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if (it == visited[pol].end()) |
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{ |
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NodeManager* nm = NodeManager::currentNM(); |
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SkolemManager* sm = nm->getSkolemManager(); |
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Trace("sep-preprocess") << "Pre-skolem emp " << n << " with pol " << pol |
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<< std::endl; |
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Node ret = n; |
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if (n.getKind() == kind::SEP_EMP) |
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{ |
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if (!pol) |
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{ |
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TypeNode tnx = n[0].getType(); |
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TypeNode tny = n[1].getType(); |
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Node x = |
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sm->mkDummySkolem("ex", tnx, "skolem location for negated emp"); |
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Node y = sm->mkDummySkolem("ey", tny, "skolem data for negated emp"); |
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return nm |
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->mkNode(kind::SEP_STAR, |
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nm->mkNode(kind::SEP_PTO, x, y), |
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nm->mkConst(true)) |
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.negate(); |
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} |
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} |
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else if (n.getKind() != kind::FORALL && n.getNumChildren() > 0) |
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{ |
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std::vector<Node> children; |
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bool childChanged = false; |
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if (n.getMetaKind() == kind::metakind::PARAMETERIZED) |
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{ |
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children.push_back(n.getOperator()); |
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} |
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for (unsigned i = 0; i < n.getNumChildren(); i++) |
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{ |
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bool newPol, newHasPol; |
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QuantPhaseReq::getPolarity(n, i, true, pol, newHasPol, newPol); |
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Node nc = n[i]; |
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if (newHasPol) |
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{ |
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nc = preSkolemEmp(n[i], newPol, visited); |
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childChanged = childChanged || nc != n[i]; |
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} |
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children.push_back(nc); |
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} |
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if (childChanged) |
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{ |
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return nm->mkNode(n.getKind(), children); |
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} |
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} |
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visited[pol][n] = ret; |
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return n; |
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} |
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else |
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{ |
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return it->second; |
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} |
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} |
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} // namespace |
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SepSkolemEmp::SepSkolemEmp(PreprocessingPassContext* preprocContext) |
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: PreprocessingPass(preprocContext, "sep-skolem-emp"){}; |
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PreprocessingPassResult SepSkolemEmp::applyInternal( |
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AssertionPipeline* assertionsToPreprocess) |
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{ |
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std::map<bool, std::map<Node, Node>> visited; |
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for (unsigned i = 0; i < assertionsToPreprocess->size(); ++i) |
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{ |
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Node prev = (*assertionsToPreprocess)[i]; |
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bool pol = true; |
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Node next = preSkolemEmp(prev, pol, visited); |
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if (next != prev) |
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{ |
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assertionsToPreprocess->replace(i, rewrite(next)); |
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Trace("sep-preprocess") << "*** Preprocess sep " << prev << endl; |
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Trace("sep-preprocess") << " ...got " << (*assertionsToPreprocess)[i] |
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<< endl; |
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} |
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visited.clear(); |
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} |
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return PreprocessingPassResult::NO_CONFLICT; |
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} |
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} // namespace passes |
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} // namespace preprocessing |
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} // namespace cvc5 |